Only problem I see here is integrating this will all of the custom fields and post types that have evolved. This plugin is going to need a simple API that programmers can interface with allowing them to create intuitive ways for users to handle Shortcodes, shortcode IN custom fields, custom fields created with things like Redux and ACF…

Please do this, its a huge task, maybe if WordPress took people off of Gutenberg and put them onto this we would have a fantastic product!!!